Hello!
-x / 4 + 5 = -3
Subtract 5 from both sides
-x / 4 = -8
Multiply both sides by 4
-x = -32
Since x is negative we can multiply both sides by -1 to make x positive
x = 32
The answer is 32
Hope this helps!
Answer:
No Solution.
Step-by-step explanation:
y=-3x+2
y=-3x-7
------------
-3x+2=-3x-7
-3x-(-3x)+2=-7
-3x+3x+2=-7
2=-7
no solution
Answer:6x3
Step-by-step explanation:
Answer:
The percentage rate of decay per year is of 3.25%.
The function showing the mass of the sample remaining after t is 
Step-by-step explanation:
Equation for decay of substance:
The equation that models the amount of a decaying substance after t years is given by:

In which A(0) is the initial amount and r is the decay rate, as a decimal.
Every 21 years, its mass decreases by half.
This means that
. We use this to find r, the percentage rate of decay per year.



![\sqrt[21]{(1-r)^{21}} = \sqrt[21]{0.5}](https://tex.z-dn.net/?f=%5Csqrt%5B21%5D%7B%281-r%29%5E%7B21%7D%7D%20%3D%20%5Csqrt%5B21%5D%7B0.5%7D)



The percentage rate of decay per year is of 3.25%.
Given that the initial mass of a sample of Element X is 80 grams.
This means that 
The equation is:



The function showing the mass of the sample remaining after t is 